Center-indicating device



F. F. CLARKE.

CENTER INDIBATING DEVICE. APPLICATION man APR. 7. 1919.

1,35 ,50 I Patented Aug. 31, 1920.

ATTORNEYS FREDERICK F. CLARKE, or FRANKLIN, mmsmvmm; essie'nonl'nio esteem MACHINE TOOL COMPANY, on FRANKLIN;ifENNSYLVANIi-l; n CORPORATI C PEN S LV NI Y T 0 all whom it may wmervil V a H Be it known thatl, FREDERICK CLARx a citizen of the United States of America,

and a resident of Franklin, Pennsylvania, have invented a new and useful Improvement in Center-Indicating Devices, which invention is fully set forthin the following specification.

This invention relates to center-indicating devices for boring and turning mills; In the operation of such mills it is frequently desirable, especially infboring operations, to position the tool socket so that its longitudinal axis :is. in. exact. coincidence V withthe axis of rotation of the table and,

while it is possible to bring the tool socket into approximate central position by use of the traversing mechanism and afinal adj ustment device, it is exceeding difficult to bring the tool socket so that its centerline; passes exactly through the center of thetable unless some indicating mechanism is employed to sh'owwhen saidposition. is reached. In my Patent No. 1,185,065,.granted May 30,

1916, I have disclosed and claimed a center-'- indicating device for accomplishing thispurpose, and my presentinvention has for an object to provide an improved: and sim' same end. a p v V I iThe invention is capable of receiving a variety of mechanical expressions, one of which is shown on the accompanyin'g'drawolified f construction for accomplishing the ing, but it is to be expressly understood that the drawing is, for purposes of illustration only and is not to be, construed as a definition of the limits of the invention, reference being had to; the appended cla ms for'thatfl purpose.

Referringin detail to said drawing, i Figurel 1s apartial elevation of'the, saddie and cross-rail'of' a vertical boring and turning mill and shows a center-indicating device embodying the present nventionin its non-Center-indicating positi'on; I

' Fig. 2 is a partial cross-section through i the saddle and cross-ra-il showing the indieating mechanism in side elevation.

cating member in center indicating position, and

Fig. 1 is an enlarged rear'view showing the means for normally maintaining the in- Fig. 8 is a front view showing the indi-.

'CENT e-INDICATING DEVICE.

position;

1 designatesrthe saddle, 2 the crossrail,

at any suitable position with a slot 5, which dic'ating member nqn-center-indiating' Specificationof Letters Patent. 7 P t nt g g 31,192}; AP li atiCnfiIedA riI 7, 1919. Serial massages, l

In the form shown the saddle isprovided; i 7

may be either straight. oriarcuate, in which" is mounted to slide an indicating member 6 provided with a mark? which in one position of the member 6 is designed toregister;

with a mark 8 suitably provided on thesad.

dle.; The indicating member 6 is shown as i anelongated plate attached to a..v stem v.9

mounted for sliding movement in alslot 10 which extends-from the front to the rear of;

the saddle, at which point the stem 9 isgconnected to an arm 11 pivotallymouiite d in a I recess 12 provide'dinthe rear face of, the

saddle." NfVhile thearm ll may bemo unted 1n any suitable way, it is shownas provided with a pin'13 engaged in, a socket 14;." V

To normally maintainfthe indicating,

member 6 so that its markv is out of Qregis: ter with the mark 8, means are provided for normally retaining said member at one end 7 of itsslot. While said meansma be of any suitable construction, the form s owncomprlses a pin 1 5,w1th a reduced portion 116 mounted for reciprocat on in a-recess 17. prorounds the' reduced portion '16 and, by engagement .with' the shoulder thereby pro-.1

vided on -the "pin 15, maintains-said pin in,

engagement with the stem 9- of the To operate the indicating member solas to move the mark 7 into register, .wlththe mark 8 suitable means are mounted on the crossrail. In the form shown apinQ O ispra vided on the cross rail and'is' 'designed'lto,

engage the pivoted arm .11, andmo'vez the indicating member 6 into center-indicating position, a groove, as illustrated at 21,. being provided in the rear face 'of'the' saddle for the passage of said pin.

, 85 vided ifnfthe saddle. A'coilj spring 18 sur-- l a The indicating member is normally main 7 action of spring 18 (see Fig. 4).

tained in the position shown in Fig. 1 by the As the center line of the tool socket approaches the center of the table, however, pin 20 engages arm' 11 and moves member 6 to the left as viewed in'Fig. 1, and the construction and arrangement is such that when said center. line exactly passes throughthe center of the table, mark 7 comes into register with mark 8 as shown in Fig. 3.

While the indicating member 6 has been, shown as mounted for rectilinear movement,

it is apparent that the slots and 10 could be made arcuate about the center 13 without departing from the spirit'of this invention. Furthermore, while the indicating member has been shown as mounted on the saddle and its actuating member as mounted on the cross-rail,'the arrangement of these parts could be reversed within the purview of this invention; In fact, while the embodiment of the invention illustrated on the drawing has been described with considerable particularity, the invention is not limited thereto for .it is capable of receiving a variety of mechanical expressions some of which will readily suggest themselves to'those skilled in the art. eference is therefore to be had to the appended claims for a definition of the limits "of the invention.

lVhatis claimed is: 1. A center-indlcatmg device for borlng and turning mllls comprislng a rectilineal'ly- 1 movable indicating member carried by. the

saddle of the mill, and means on the crossrail of said mill for actuating said member to indicate the coincidence'of the center line of the tool-socket with the center of the table.

2. A center-indicating device for boring and turning mills comprising a rectilineallymovableindicating member carried by the saddle of the mill,'m'eans on the cross-rail of said mill for actuating said member to indicate the coincidence of the center line of the tool socket with the center or the table, andmeans normally maintaining said inclicating member out of said indicating position.

3. In combination with the saddle and crossrail of a boring and turning mill, a

slide indicating member carried'by one of said elements and a slidable actuating mem-' ber earned by the other of said elements,

said members coacting'to indicate when the center line of the tool socket passes through the center of the table.

' 4; In combination with the saddle and cross'rail of a boring and turning mill, a

mill to move said member into center-indi-' catlng position when the center line of the tool holder passes through the center of the table. i

. 6. A center-indicating device forboring and turning mills comprising an indicating member mounted on the saddle of the mill and having an arm extendingtherefrom, and means on the cross rail of th'emill'for directly operating said arm and thereby said member to indicate when the center line of thetool socket passes through the center of the table. i

7 -A center-indicating device for a boring and turning mlll comprislng an indicating member, an arm pivoted on the saddle of said mill and connected tosaid member, and

means on the cross rail of the mill'formoving said arm and thereby said member into center-indicating position. I V

8. A center indicating device for a boring and turning mill comprising an indicating member, an arm pivoted on the'saddle of said mill and connected to said member, means for moving sald arm and thereby said the mill, and means on the cross rail ofthe.

member into center-indicating position, and p a spring normally holding said member out of center-indicating position.

9. In combination 'with the. saddle and cross rail ofa boring and turning mill, an

arm pivoted on one of said elements, an indicating member connected to said arm, and means on the other of said elements for engaging said arm and moving sa d lnd catlng 'member into center-indicating position.

10. In combination with the'saddle and cross rail of a boring'and turning mill, a

rectilineally-movablef indicating member on one of said elements, and means on the other of said elements for moving said member into center-indicating position when the axis of the tool holder coincides with the axis ofthe table.

In testimonywhereof I have signed this specification. f r i I FREDERICK F. CLARKE, i 

